** Tags added: disco

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  Temporary failure in name resolution in Python 3.7.2

Status in python3-defaults package in Ubuntu:

Bug description:
  My Python application works in 18.10 fine, but when upgrading to 19.10
  for development reasons the same script produces the errors reported
  below. I have checked on the Python bug tracker and there are no
  related bug reports.

  Traceback (most recent call last):
    File "/usr/lib/python3.7/urllib/request.py", line 1317, in do_open
    File "/usr/lib/python3.7/http/client.py", line 1229, in request
      self._send_request(method, url, body, headers, encode_chunked)
    File "/usr/lib/python3.7/http/client.py", line 1275, in _send_request
      self.endheaders(body, encode_chunked=encode_chunked)
    File "/usr/lib/python3.7/http/client.py", line 1224, in endheaders
      self._send_output(message_body, encode_chunked=encode_chunked)
    File "/usr/lib/python3.7/http/client.py", line 1016, in _send_output
    File "/usr/lib/python3.7/http/client.py", line 956, in send
    File "/usr/lib/python3.7/http/client.py", line 1384, in connect
    File "/usr/lib/python3.7/http/client.py", line 928, in connect
      (self.host,self.port), self.timeout, self.source_address)
    File "/usr/lib/python3.7/socket.py", line 707, in create_connection
      for res in getaddrinfo(host, port, 0, SOCK_STREAM):
    File "/usr/lib/python3.7/socket.py", line 748, in getaddrinfo
      for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
  socket.gaierror: [Errno -3] Temporary failure in name resolution

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/usr/lib/pihole-panel/main.py", line 312, in <module>
      win = GridWindow()
    File "/usr/lib/pihole-panel/main.py", line 37, in __init__
      self.updates_frame = self.draw_updates_frame()
    File "/usr/lib/pihole-panel/main.py", line 132, in draw_updates_frame
      if self.version_check() == True:
    File "/usr/lib/pihole-panel/main.py", line 53, in version_check
      get_version = urlopen('https://urlchanged.com').read()
    File "/usr/lib/python3.7/urllib/request.py", line 222, in urlopen
      return opener.open(url, data, timeout)
    File "/usr/lib/python3.7/urllib/request.py", line 525, in open
      response = self._open(req, data)
    File "/usr/lib/python3.7/urllib/request.py", line 543, in _open
      '_open', req)
    File "/usr/lib/python3.7/urllib/request.py", line 503, in _call_chain
      result = func(*args)
    File "/usr/lib/python3.7/urllib/request.py", line 1360, in https_open
      context=self._context, check_hostname=self._check_hostname)
    File "/usr/lib/python3.7/urllib/request.py", line 1319, in do_open
      raise URLError(err)
  urllib.error.URLError: <urlopen error [Errno -3] Temporary failure in name 

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